A GRANDFATHER is suspected of killing his wife, daughter and his four autistic grandchildren in a murder-suicide yesterday.

Katrina Miles and her four children who were found TRAGICALLY murdered

Peter Miles is believed to have made a 5am telephone call to police before turning a gun on himself.

Police discovered the bodies of the four children and three adults soon afterwards at the farm at Osmington, south of Perth in Western Australia.

Two firearms were found at the scene and police confirmed they were not looking for anyone in connection with the horror shootings. The young mother was named locally as Katrina Miles. Her children, Ryan, Taye, Ayre and Kadyn, were aged between eight and 13.